Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 12
... occur in the form of little bags of crystals ( therefore they are called " litho- cysts " ) , which are protected by curiously formed " hoods " or " covers " of gelatinous tissue ; and it is on this account that the group is called ...
... occur in the form of little bags of crystals ( therefore they are called " litho- cysts " ) , which are protected by curiously formed " hoods " or " covers " of gelatinous tissue ; and it is on this account that the group is called ...
Pagina 12
... occur in the form of little bags of crystals ( therefore they are called " litho- cysts " ) , which are protected by curiously formed " hoods " or " covers " of gelatinous tissue ; and it is on this account that the group is called ...
... occur in the form of little bags of crystals ( therefore they are called " litho- cysts " ) , which are protected by curiously formed " hoods " or " covers " of gelatinous tissue ; and it is on this account that the group is called ...
Pagina 13
... occur in all animals higher in the zoolo- gical scale than the Medusæ , so that it was of much importance to ascertain whether or not the first occurrence of this tissue was to be met with in this class . But , notwithstanding the ...
... occur in all animals higher in the zoolo- gical scale than the Medusæ , so that it was of much importance to ascertain whether or not the first occurrence of this tissue was to be met with in this class . But , notwithstanding the ...
Pagina 20
... occur in the veil . In some species the nerve - fibres become aggre- gated in the region of the generative organs , and in that of the radial canals , thus giving rise in these localities to what may be called nerve - trunks . But in ...
... occur in the veil . In some species the nerve - fibres become aggre- gated in the region of the generative organs , and in that of the radial canals , thus giving rise in these localities to what may be called nerve - trunks . But in ...
Pagina 53
... occur under the conditions named , I append tracings to give a better idea of the very marked and striking character of the results . The first tracing ( Fig . 2 ) is a record of the successive increments of the responses to successive ...
... occur under the conditions named , I append tracings to give a better idea of the very marked and striking character of the results . The first tracing ( Fig . 2 ) is a record of the successive increments of the responses to successive ...
Termeni și expresii frecvente
able ambulacral feet artificial rhythm Aurelia aurita become bell blocked brium cause ceased chloroform co-ordination continue contractile strip contractile tissue contraction contraction-waves covered-eyed Medusa crawling curare diastole direction discharge Echinoderm Echinodermata Echinus effect excising excitable tissues experiments fact feeble fibres forceps fresh water function ganglionic glycerine hour Illustrations induction shocks influence instance intervals irritability jelly-fish latter lithocyst locomotor centres manubrium marginal bodies marginal ganglia minutes movements muscle muscular mutilated naked-eyed Medusa natural rhythm nectocalyx nerve nerve-cells nerve-centre nerve-fibres nerve-ring nerve-trunks nervous network nervous system normal sea-water observed occur organ paralyzed pass pedicellariæ pedicels period of latent physiological plexus poison portion prepotent Professor pulsations radial tubes rays reflex reflex action removed response Sarsia seconds segments spasm species specimens spines spontaneity Star-fish strychnia suckers surface swimming motions swimming-bell systole tank temperature tentacles tentacular tetanus Tiaropsis indicans tion umbrella unmutilated animal wave whole